All Questions
Tagged with compressor turbofan
17 questions
18
votes
6
answers
10k
views
Why do large turbofans generally have many more LP turbine stages than HP turbine stages?
In almost every large turbofan I see, the LP turbine stages outnumber the HP turbine stages by a factor of at least 2. Here's a photo of the RR Trent 900:
The Trent 900 (like most Rolls-Royce ...
- 17.9k
17
votes
1
answer
4k
views
How much power is drawn by a turbofan to power its own compressor?
In a modern commercial airliner how much percentage of its engine power is used to power its own compressor, the ducted fan and other ancillaries like the airconditioning etc? Maybe it can't be ...
user12782
7
votes
5
answers
3k
views
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
How do the RPMs stay constant in a gas turbine engine? For example in car with piston engine, when you keep pressing the accelerator the rpms keep picking up, to keep the rpms constant you must let ...
- 295
6
votes
2
answers
12k
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Why do turbofan engines have low pressure compressors?
In my understanding turbofan engines usually have 2 stages of compressors:
one low pressure compressor
followed by a high pressure compressor
But it looks like the high pressure compressor ...
- 61
5
votes
3
answers
3k
views
Why does the Trent XWB have intermediate compressor stages?
I realized that the Rolls-Royce Trent XWB on the Airbus A350 has intermediate compressor stages. Why is that?
Other engines like the CFM56 or IAE V2500 that power most of the A320-family have low ...
- 685
5
votes
2
answers
2k
views
Why do compressors constrict flow if this decreases pressure?
An axial compressor (and a ramjet intake, for that matter) is commonly depicted as decreasing the volume of air travelling through as we move closer to the combustion chamber. In axial compressors, ...
- 153
5
votes
2
answers
2k
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Do any propellers/propfans use stator vanes? Why is this not a commonplace feature?
I understand that axial-flow turbine engines generally include stator vanes behind every(?) compressor and turbine stage. This makes quite intuitively sense, because without them the rotating blades ...
- 783
4
votes
7
answers
4k
views
How does a fan in a turbofan engine suck air in?
I watched lots of video related to sucking process of a fan in a turbofan engine, but I'm confused at a point.
In this link and many videos like this, I found the fan'...
- 244
4
votes
1
answer
768
views
Are low pressure (LP) compressors and booster compressors the same thing?
Based on the above picture, are "LP compressor" and "Booster compressor" different names for the same thing or are they actually different things?
- 190
3
votes
3
answers
499
views
Would there be a purpose for a set of compressors in an electric turbo fan?
This is actually a two part question. Would there be a purpose to a compressor in an electric turbofan where there is no need for a combustion chamber, and if not, is there then a purpose for a bypass ...
- 31
2
votes
2
answers
205
views
What do these temperature data listed in the EASA Type Certificate Data Sheet mean?
Could you tell me what is the Maximum Permissible Indicated Turbine Temperature (ITT) and the ambient limit temperature for sea level static thrust?
- 323
2
votes
0
answers
355
views
Why aren't compressor and turbine blades flat? [duplicate]
Why are the compressor and turbine blades of a jet engine shaped as airfoils? Why can't they be flat?
1
vote
1
answer
455
views
Do compressors and turbines in jet engines end with rotor or stator?
I am trying to understand compressor and turbine design principle based on stators and rotors.
I know that turbines and compressors both have a rotating and fixed section that constitute a stage.
For ...
- 244
1
vote
1
answer
96
views
What do the variable bleed valves on a CFM56 engine look like when starting said engine?
What do the variable bleed valves look like internally when starting engines? Does it exist a video of the VBV in operation?
- 11
0
votes
1
answer
127
views
Why do we take into consideration holes for pressure thrust in jet engine calculations?
In many sources related to jet engine thrust calculations such as https://www.jet-x.org/a8.html ,
pressure thrust of a module such as combustion chamber, nozzle or compressor, is calculated by front ...
- 244
0
votes
1
answer
152
views
What gas turbines have the following configuration?
Is there any jet engines--with published data on the dimension of the turbines and compressors--that are of the configuration of 2 Low Pressure compressor, 8 High Pressure compressor, 2 High Pressure ...
- 323
-1
votes
1
answer
111
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How to understand turbo machines?(compressors,fans,pumps,turbines,etc..)
From what I understood, the energy transfer between the blades and the fluid(fluid to blade or blade to fluid) occurs due to the curvature of the blade.Its because of this curvature the stream of the ...
- 1